/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: LianBao
 * Date: 2024-03-01
 * Time: 16:01
 */
class Base{
    public Base(String s){
        System.out.print("B");
    }
}

public class Derived1 extends Base{
    public Derived1 (String s) {
        super("C");
        System.out.print("D");
    }
    public static void main(String[] args){
        new Derived1("C");
    }
}